Population Forecast
5 year Forecast - 1.4%
The current population of the Williamsport, PA Market is 584,246 as of the January 2026 PopStats estimate. PopStat’s Trend models indicate a 5 year population change of 1.4%, resulting in a Population of 592,422 by January 2031. This percentage change in Population ranks 117th across STI Markets. The Williamsport, PA Market currently ranks 139th in overall population, and will rank 139th by January 2031.
High and Low Range - -2.2% to 4.3%
While the summation of mid range 5 year forecasts foresee a change in Population of 1.4% for Williamsport, PA Market. The forecast high ranges of these forecasts leaves open the possibility for a Population change as high as 4.3% at 609,107. Similarly a population change as low as -2.2% at 571,129 is not without possibility.
Figure 73: Population Trend and Forecast
10 year Projections - 2.8%
By January 2036 we project the Population of the Williamsport, PA Market to be 600,545 resulting in a change of 2.8% compared to the current Population. This projected percentage change in Population ranks 118th across STI Markets. The Williamsport, PA Market currently ranks 139th in overall population, and will rank 139th by January 2036.
